In article <47F6D1FC.5010200@comcast.net>,
"Richard B. Gilbert" <rgilbert88@comcast.net> wrote:

> Roger 2008 wrote:
> > "Gordon Burditt" <gordonb.sh6xy@burditt.org> wrote in message
> > news:XrOdnYKg7an-52vanZ2dnUVZ_vOlnZ2d@internetamerica...
> >
> >>>Please do not forget who the original poster was and his questions: He
> >>>asked:
> >>>"can I display my own LAT/LON values somehow without a map application ?"
> >>
> >>For some cell phone implementation of "GPS" (this one doesn't involve
> >>actual satellites talking to your phone), your position coordinates
> >>are present at the cell towers and somewhere in the offices of Big
> >>Brother, but not on your cell phone. If a map application can get
> >>your position at all, it has to ask your cell provider to send it,
> >>and that may cost money.
> >
> >
> > Oh yeah, now that you mention it. My first camera phone called it GPS but
> > when you read further about it, it was just using cell phone towers.
> >
> > BTW I have met a person with an iPHONE that thinks his phone has GPS and he
> > even showed me "Google Maps for Mobile" on it.
> >
> > I thought he had a messed up GPS reading because it had us way across the
> > street and then I learned later the iPHONE uses cell phone towers for an
> > approximate location on "Google Maps for Mobile."
> >
> >
>
> GPS, or at least the civilian version of it, is only accurate to within
> about 300 feet or 100 meters. I once did a "site survey" using a
> Motorola M12+T GPS timing receiver. The software I used plotted
> something like 10,000 position readings on the map. The result was a
> strip about 10 meters wide and 100 meters long and oriented ENE-SSW. My
> antenna was more or less in the middle of this mess.
>
> The military uses a different set of signals from the same satellite and
> gets accurracy good enough for weapons targeting. This level of GPS is
> available only to the military and certain defense contractors. Us
> lowly civilians can't get it.
>
> As far as I know, a cell phone tower has no means of determining the
> direction your signal is coming from.

It's been changed for a few years, now more like 15 meters. Clinton was
the one that changed that.

There is supposedly a new civilian GPS system in the works, one that
uses more satellites and with technolgy that allows for obstructed views.
Also supposed to be far more

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